Wyoming Math 5.OA.2

Math5th GradeOperations and Algebraic Thinking

The Standard

Write simple expressions requiring parentheses that record calculations with numbers, and interpret numerical expressions without evaluating them.

2023 Wyoming Mathematics Content and Performance Standards · Write, interpret, and/or evaluate numerical expressions.

Teacher's field guide

What Students Need to Do: Students write expressions from spoken calculations. They use parentheses to show which operation happens first, then describe expressions without finding their values.
What Mastery Looks Like: Given “add 6 and 4, then triple the result,” a student writes 3 × (6 + 4). They explain that the whole sum is tripled, without calculating.
Common Misconceptions: Students may write 3 × 6 + 4 when the whole sum needs to be tripled. They may ignore parentheses or calculate an answer when asked to describe the operations.
How to Assess It: Exit ticket: Write an expression for “add 9 and 2, then multiply by 4.” Describe what 3 × (8 − 5) means without calculating.

Lesson moves

Give pairs three paper plates and counters; have them put 4 red and 2 blue counters on each plate, then write the expression.
Ask students to explain in writing how 5 × (4 + 2) and 5 × 4 + 2 give different instructions.
Make cards with expressions and spoken calculations; have pairs match them and explain where the parentheses belong.
Show a menu with a $6 sandwich and $2 drink; ask students to write the cost expression for three people without totaling it.

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